make login page date different depending on auth type

webserver/login_page.go

@@ -10,10 +10,28 @@ type LoginPageData struct {
 	IsHiddenClassList string
 	LoginData         CustomizableLoginData
 }
+type AuthStyle int
+
+const (
+	AuthStylePassword AuthStyle = 0
+	AuthStyleOAuth    AuthStyle = 1
+)
+
+type AuthData interface{}
+
+type PasswordAuthData struct {
+	Username string
+	Password string
+}
+
+type OAuthAuthData struct {
+	Username string
+	Password string
+}
 
 type CustomizableLoginData struct {
 	ServiceName         string
-	AuthRequestFunction func(string, string) bool
+	AuthRequestFunction func(AuthStyle, AuthData) bool
 }
 
 var LoginPageDataCustomizations CustomizableLoginData
@@ -27,15 +45,27 @@ func loginHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if r.Method == http.MethodPost {
-		username := r.FormValue("username")
-		if strings.Contains(username, "/") {
-			tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
-		}
-		password := r.FormValue("password")
+		action := r.FormValue("action")
 
-		auth_success := LoginPageDataCustomizations.AuthRequestFunction(username, password)
-		if auth_success == false {
-			tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
+		if action == "password" {
+			username := r.FormValue("username")
+			if strings.Contains(username, "/") {
+				tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
+			}
+			password := r.FormValue("password")
+
+			auth_success := LoginPageDataCustomizations.AuthRequestFunction(AuthStylePassword, PasswordAuthData{
+				Username: username,
+				Password: password,
+			})
+			if auth_success == false {
+				tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
+			}
+		} else {
+			auth_success := LoginPageDataCustomizations.AuthRequestFunction(AuthStyleOAuth, OAuthAuthData{})
+			if auth_success == false {
+				tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
+			}
 		}
 	}
 }

webserver/pages/login_page.html

@@ -34,8 +34,8 @@
         </div>
     </div>
     <div id="login_buttons">
-        <button type="submit">Login with password</button>
-        <button type="submit" id="login_with_oauth"><img src="/favicon.ico"/></button>
+        <button type="submit" name="action" value="password">Login with password</button>
+        <button type="submit" id="login_with_oauth" name="action" value="oauth"><img src="/favicon.ico"/></button>
     </div>
 </form>